Figure 1-7. Columnar calcite in a stalactite. In this view in plain-polarized light, only a few straight crystal boundaries (at blue arrows) are visible. The corresponding cross-polarized view is more revealing, as is typical of most observation of palisade and columnar microfabrics. Photomicrograph was taken in plane-polarized light; field of view is 2.3 mm wide. Haylaa Cave, Somalia; Stalagmite HL4; thin section HL4A. Sample collected by Dr. George A. Brook.
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